uva 11636

#include<cstdio>
#include<cstring>
int main()
{
	int n,t=1;
	while(~scanf("%d",&n)&&n>=0)
	{
		
	  int i=1,tot=0;
	  while(i<n)
      {
    	tot++;
    	i<<=1;
	  }
	  printf("Case %d: %d\n",t++,tot);
    }
    return 0;
}